DA-100 tuned pipes set up

[scoubidou]

Hi guys
I burned 1 more gallon of gas and did some tests with PT 27x10 and 28x10 prop. I had some emails feedback from MTW and here is what they recommend:

from MTW

We had amended the pipes once. The first series was 640 mm without outlet tube. The
> current pipe is 680 mm without outlet tube. The longer pipe needs a header
> length of 310 mm with Mejzlik 28/10 or 29/10. We only work with header
> lengths of 310-360 mm as this is the maximum range. If the headers are
> longer than that, they could break more easily.
> Unfortunately, we do not have a graph for this.
>
> Hope we have been of help.
>
> Mit freundlichen Grüßen / Best regards,
> Volker Weiershäuser
> p.p. Maike Strauss

I bought my pipes in October 2007 and they are from the first generation. For that reason, they need longer headers and MTW recommend 360mm minium for Mejlzick 28x10. Presently, ican turn Mejlzick 28x10 at 6400-6500 RP'M and PT-27x10 at 6600 RPM but the throtle response is not very good with my short headers 11'' (280mm).

Second emails from MTW

Hello Daniel,

We have seen on the picture that it is one of the first pipes you have. You need a header length of 360 mm with e.g. 28 /10 Mejzlik, but with 26/12 or 27/10 a header length of 280 mm would be acceptable. The current pipe is also 680 mm, however, the first part from beginning to first ring is longer that is why the header can be shorter. If you think the current pipe suits you better, you could contact Desert Aircraft. They have our pipes on stock.

Hope we have been of help.

Mit freundlichen Grüßen / Best regards,
Volker Weiershäuser
p.p. Maike Strauss



Finally, here is a good graph that Pé Reivers (Netherlands) developped with different headers lenght.

Hope it helps
Daniel